Sony TA-N55ES repair

I have an old Sony TA-N55ES in for repair. Y'know you have some talents and friends knows about it.

The pre-amp section has a STK3102, but it has retired. I've tried to find another, but for many reasons I have given up on that.
So - I stumbled over a MOFI3850Se pre-amp, and think this could be an alternative. Just have to add a transformer 15-0-15

There is just one obstacle. The original interface between the STK3102 and pwr-amp has two wires. How do I manipulate my MOFI to do the same signal transfer?
 

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